In order to account for the color reproduction in fine detail of the color film, a model shown diagrammatically in Fig. 6 is proposed that makes use of (1) the optical diffusion for the lens-film combination, (2) the lateral chemical diffusion of development-inhibiting and development-accelerating reaction product known as the adjacency effect, and (3) the vertical chemical diffusion of them known as the inter-layer effect or the inter-image effect. The imput light distributions which are given as the exposure density distributions of the object scene are converted into effective exposure distributions by the convolutions of the input exposure distributions with the spread functions which characterize the lens-film optical diffusion and the lateral chemical diffusion. The effective exposures are converted to dye amount through the use of large-area H & D curves of the color film. The dye amounts are then corrected for the inter-image effects that involve the vertical chemical spread functions and the gradients, and dye amounts displayed fanally in three layers are obtained.
MTFs of inter-image effects, C (u), are defined between the dye amounts and the equivalent dye amounts which equivalent to the amount of inter-image effects in the other dye layers. The vertical chemical spread functions, j (x), are obtained from Fourier inverse transform of MTFs of the inter-image effects.
Computer simulations of color reproductions in fine-detail by the model are verified experimentally by the practical picture tests.
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